fix logging test - enable lnd to satisfy metric

fix proc exception, add --debug command support

Author: macgyver13

test/data/logging/network.yaml

@@ -12,7 +12,13 @@ nodes:
     addnode:
       - tank-0000
     lnd:
-      enabled: true
+      channels:
+        - id:
+            block: 300
+            index: 1
+          target: tank-0001-ln
+          capacity: 100000
+          push_amt: 50000
       metricsExport: true
       prometheusMetricsPort: 9332
       extraContainers:

test/data/logging/node-defaults.yaml

@@ -3,3 +3,6 @@ image:
   repository: bitcoindevproject/bitcoin
   pullPolicy: IfNotPresent
   tag: "27.0"
+
+lnd:
+  enabled: true

test/test_base.py

@@ -68,10 +68,11 @@ def assert_log_msgs(self):
     def warnet(self, cmd):
         self.log.debug(f"Executing warnet command: {cmd}")
         command = ["warnet"] + cmd.split()
-        proc = run(command, capture_output=True)
+        capture_output = "--debug" not in cmd
+        proc = run(command, capture_output=capture_output)
         if proc.stderr:
             raise Exception(proc.stderr.decode().strip())
-        return proc.stdout.decode().strip()
+        return proc.stdout.decode().strip() if proc.stdout else ""
 
     def output_reader(self, pipe, func):
         while not self.stop_threads.is_set():